Improvement in bed-plates for rag-engines



` `M. Maven. IBed-Plates for R A l ag Engines No.157 625. Y I

s v PaKentedVDec.8,187'4.

? p l llllll UNITED STATES PATENT OEEroE.

MARTIN MEYER, OF CINCINNATI, OHIO.

lIMPROVEMENT IN BED-PLATES FOR RAG-ENGINES.

Specification forming part of Letters Patent No. l 57,625, dated D *cember 48, 1874 application led October 22, 1874.

To all whom it may concern.

Be it known that I, MARTIN MEYER, of Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and useful Improvement in Cutters for Rag-Grinding Machines, of which the following is a specification:

My invention relates to an improved construction of the cutters of rag-grinding machines, whereby they are more easily restored to their effective condition after wear.

As in the ordinary machines, my cutters are composed of congeries of metal blades; but these blades, instead of being secured in a pack or bundle with interposing strips, are, in my improvement, embedded in a mass, block, or gangue of relatively softer metal, which is cast around the blades in a suitably-formed mold, so that when the knives become worn down to the bed the operator can reset the bar or block by simply plowing or chipping out a sufficient portion of the intervening metal to restore the knives to their proper prominence.

This invention supersedes the necessityY of taking the bar entirely apart, as is now neces sary under the customary form of such bars.

In the accompanying drawing, Figure l is a vertical section through a portion of a raggrinding machine embodying my improve; ment. Fig.V 2 is a perspective view, on a larger' scale, of. one of my improved cutters detached from the machine. Fig. 3 is a transverse scction through one of the cutters. Fig. et is a perspective view of one of the cutters detached from its soft-metal bed.

A represents a number of steel knives or blades. B is a mass of relatively soft metal, which is cast around the set of blades. This metal may be of any suitable alloy which is capable of fusion at a heat that will not impair the temper of the blades, and such as, when set, shall be relatively so much softer than the material of the blades as to be readily ground, cut, or chipped, or melted away for restoration of the cutter to usefulness after becoming worn.

Of the various alloys which maybe used for this purpose are the following, (in weightz) Lead, ten parts; zinc, three part-s; bismuth, one part.

Whatever metal be used for the bed, the knives, before being set in the mold, are eitlier tin, zinc, or nickel plated, to cause a thorough cohesion between the knives and the substance of the embedding mass. A

I claim as new and of my invention- As a new article of manufacture, a cutter,

for rag-grinding machines, whose knives, eX-

lcept the cutting-edges, are wholly embedded in a block of metal fusible at a temperature which will not destroy the temper of the blades, substantially as set forth.

In testimony of which invention I hereunto set my hand.

Witnesses: MARTIN MEYER.

GEO. H. KNIGHT, O. P. OAYLoR. 

